I don't know what files you are using, but the Scrub Road map in my install of 4.0.0 (installed with Morpheus' installer) are sectored. The original version from the .dats are not, which was why I didn't include that map in my original random encounter fix. But I did fix the one I included with 4.0.0. I can't run through any of the boulders in my install, so I don't know what to tell you as to why it's not sectored for you. The good news is that the fix is easy. Just copy the sector files from the Scrub map. They two maps are identicle except for the artwork of the road.